I can't believe the replies you received.
My mother always told me if I had nothing nice to say, say nothing at all. I believe it is important to have an opinion, but there is no need to be nasty about it. That being said, I will NOT
discuss that subjact further now or in the future.
To start the actual topic, I was an ASE certified Master Mechanic (I let the license lapse as I am in a different career now) and I currently hold my AC license.
I agree that the car should go back to the dealer. Please go by the "You will attract more flies with honey than vinegar" saying. Call the dealership and explain to the service manager that yuo had your car repaired there and the AC no longer works. Please suggest you'd like them to look at it as it may not have been filled or has developed a leak while the repair was done as it did not work when you picked it up. Also explain the distance situation. Tell them that you will need a loaner car, free of charge, and that the work should also be done free of charge.
If this is not possible, here is the answer to your question. 134a recharge kits are available over the counter or online. It consists of a can and a hose the attaches to the low side of the AC. The '07 Prius (what I own) holds 0.93 to 1.06 lbs (tag is under the hood). Assuming the '05 and '07 are the same, the high side is a grey cap with the letter "H" on it and is attached to a silver pipe just to the right of the washer fluid container and to the left of the engine. The low side is a grey cap with a letter "L" and is to the right of the air box but left of the Hibrid Energy silver box, in front of the master cylinder but behind the radiator. It is also attached to a silver pipe. Sorry, but I do not have a picture. Niether are "burried" behind anything and are easily accesible.
Follow the directions on the container. It is fairly easy to do. If you have any questions, let me know. Good luck!